Messages sent into space directed at extraterrestrials may have been too boring to earn a reply, say two astrophysicists trying to improve on their previous alien chat lines.

Humans have so far sent four messages into space intended for alien listeners. But they have largely been made up of mathematically coded descriptions of some physics and chemistry, with some basic biology and descriptions of humans thrown in.

Those topics will not prove gripping reading to other civilisations, says Canadian astrophysicist Yvan Dutil. If a civilisation is advanced enough to understand the message, they will already know most of its contents, he says: “After reading it, they will be none the wiser about us humans and our achievements. In some ways, we may have been wasting our telescope time.”

In 1999 and 2003, Dutil and fellow researcher Stephane Dumas beamed messages in a language of their own design into space. Now, they are working to compose more interesting messages.

“The question is, what is interesting to an extraterrestrial?” Dutil told New Scientist. “We think the answer is using some common ground to communicate things about humanity that will be new or different to them – like social features of our society.” Fortunately those subjects are already being described mathematically by economists, physicists and sociologists, he adds.